Hey guys, I've been reading about this shit for a bit... it's my understanding that the 88-89 PM5 ecu is a son of a bitch to tune because of the lack of an external eprom. I have a PM5 ecu but it's a 1990, and when I open it there is the spot for the 28(?)pin and it says "EPROM" right on the board in the middle of the pin holes... Can these PM5's be tuned or are they still useless? I was considering using it as my guinea pig in case my first attempt at soldering an ecu doesn't go well Thanks!!!!!!